History
John Stone Stone patented the first direction finding system in 1902 (U.S. Patent 716,134). Alternate and improved direction finding systems were invented by Lee de Forest in 1904 (U.S. Patent 771,819), and by Italian engineers Ettore Bellini and Alessandro Tosi in 1909 (U.S. Patent 943,960). In 1919, British Army Officer Frank Adcock proposed an improved direction finding antenna design Adcock antenna (UK Patent 130,490).
The US Army Air Corps in 1931 tested a primitive radio compass that used commercial stations as the beacon.
Read more about this topic: Radio Direction Finder
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—Ben C. Bradlee (b. 1921)
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